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(CNN) — The George Zimmerman investigation was hijacked “in a number of ways” by outside forces, said the former police chief of Sanford, Florida.

Bill Lee, who testified Monday in Zimmerman’s second-degree murder trial, told CNN’s George Howell in an exclusive interview that he felt pressure from city officials to arrest Zimmerman to placate the public rather than as a matter of justice.

“It was (relayed) to me that they just wanted an arrest. They didn’t care if it got dismissed later,” he said. “You don’t do that.”

When Sanford police arrived on the scene on February 26, 2012, after Zimmerman fatally shot unarmed 17-year-old Trayvon Martin, they conducted a “sound” investigation, and the evidence provided no probable cause to arrest Zimmerman at the scene, he said.

It had nothing to do with Florida’s controversial Stand Your Ground law, he said; from an investigative standpoint, it was purely a matter of self-defense.

Zimmerman told police he killed Martin after the teen attacked him. While the evidence at the time corroborated that claim, the ex-chief said, Lee’s lead investigator made a recommendation that Zimmerman be charged with manslaughter.

It was a matter of protocol, Lee said. Arresting Zimmerman based on the evidence at hand would have been a violation of Zimmerman’s Fourth Amendment rights, he said. Thus, the Sanford police presented a “capias request” to the state’s attorney, asking that the prosecutor determine whether it was a “justifiable homicide,” issue a warrant for arrest or present the case to a grand jury.